Power bank



FIG. 1 is a front view thereof;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof

FIG. 7 is a first perspective view thereof;

FIG. 8 is a second perspective view thereof;

FIG. 9 is a third perspective view thereof, with the power bank being in use;

FIG. 10 is a fourth perspective view thereof, with the power bank being in use; and,

FIG. 11 is a fifth perspective view thereof, with the power bank being in use.

The broken lines shown in the drawings represent portions of the power bank which form no part of the claimed design. 

CLAIM The ornamental design for power bank, as shown and described. 